gistfile1.c

#include<stdio.h>
#include<string.h>	//strlen
#include<stdlib.h>	//strlen
#include<sys/socket.h>
#include<arpa/inet.h>	//inet_addr
#include<unistd.h>	//write

#include<pthread.h> //for threading , link with lpthread

void *connection_handler(void *);

int main(int argc , char *argv[])
{
	int socket_desc , new_socket , c;
	struct sockaddr_in server , client;
	char *message;
	
	//Create socket
	socket_desc = socket(AF_INET , SOCK_STREAM , 0);
	if (socket_desc == -1)
	{
		printf("Could not create socket");
	}
	
	//Prepare the sockaddr_in structure
	server.sin_family = AF_INET;
	server.sin_addr.s_addr = INADDR_ANY;
	server.sin_port = htons( 8888 );
	
	//Bind
	if( bind(socket_desc,(struct sockaddr *)&server , sizeof(server)) < 0)
	{
		puts("bind failed");
		return 1;
	}
	puts("bind done");
	
	//Listen
	listen(socket_desc , 3);
	
	//Accept and incoming connection
	puts("Waiting for incoming connections...");
	c = sizeof(struct sockaddr_in);
	while( (new_socket = accept(socket_desc, (struct sockaddr *)&client, (socklen_t*)&c)) )
	{
		puts("Connection accepted");
		
		//Reply to the client
		message = "Hello Client , I have received your connection. And now I will assign a handler for you\n";
		write(new_socket , message , strlen(message));
		
		pthread_t sniffer_thread;
		int *new_socket2 = malloc(1);
		*new_socket2 = new_socket;
		
		if( pthread_create( &sniffer_thread , NULL ,  connection_handler , (void*) new_socket2) < 0)
		{
			perror("could not create thread");
			return 1;
		}
		
		//Now join the thread , so that we dont terminate before the thread
		//pthread_join( sniffer_thread , NULL);
		puts("Handler assigned");
	}
	
	if (new_socket<0)
	{
		perror("accept failed");
		return 1;
	}
	
	return 0;
}

/*
 * This will handle connection for each client
 * */
void *connection_handler(void *socket_desc)
{
	//Get the socket descriptor
	int sock = *(int*)socket_desc;
	//int sock = (uintptr_t)socket_desc;
	char *message;
	
	message = "Greetings! I am your connection handler\n";
	write(sock , message , strlen(message));
	
	message = "Its my duty to communicate with you";
	write(sock , message , strlen(message));
	
	return 0;
}